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Summary of Amortized Cost and Estimated Fair Value of Marketable Securities Available-for-sale (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Amortized Cost  
Mature in one year or less $ 93,691
Mature after one year through two years 72,594
Total amortized cost 166,285
Estimated Fair Value  
Mature in one year or less 93,701
Mature after one year through two years 72,553
Total estimated fair value $ 166,254